If you disagree in a meeting and your sentiment is actively dismissed, dismiss the dismisser. And say it again.

If you’re an active member of the project and you are not invited to the meeting, take it as a compliment. Your opinion is too powerful to defend against. The only way for the group-think to survive is to keep you away from it. Well done.

If your opinion is actively and repeatedly ignored, it’s too powerful to be acknowledged. Send a note to someone higher up in the organization. And if that doesn’t work, send it up a level higher still. Don’t back down.

If you look into the future and see a train wreck, set up a meeting with the conductor and tell them what you see.

When you see things differently, others will try to silence you and tell you you’re wrong. Don’t believe them. The world needs people like you who see things as they are and have the courage to speak the truth as they see it.